I have a few MDS, we imported some in the late '80's - 90's. The FIRE .61 is a strong one, and oddly you can mate the crankcase and p/l to OPS .60/.65 parts, coincidence I suppose. The engines are strong runners with nice machining, ugly machine screws, and ghastly carbs. Any decent carb of appropriate bore can be adapted to them to make a world of difference.
iI've had several MDS engines, they were good engines, however i noticed on a couple of engines it was hard to tune the carb, i found the trick was to use OS glow plugs #3 or 6 plus i took a jewelers file and opened up the fuel metering tube a bit for extra fuel, the high spee needle didn't need to adjusted so far out to get it to run reliably
Fitting a Super Tigre carb to them was a popular mod when MDS engines first came out. The local model shop used to keep stocks of them for disgruntled MDS owners. Years later we had an ARTF trainer donated to our club fitted with an MDS 58 IIRC. We had all sorts of problems with that caburetter. It would run at high speed but not at low speed or if you could get it to tick over it would not pick up. We gave the carburetter to a Rolls Royce trained engineer, yes that Rolls Royce. He machined a couple a little off the main needle. It made no difference. In the end I donated a Thunder Tiger GP 42 which flew the trainer perfectly. I wouldn't have an MDS as a gift!
Wonderfull run with a good carburetor, that crapy cheap OEM carb really sucks, but after your modifications you made it work, but with that ST 34 carby it's ANOTHER engine!
I had a MDS 48, I believe it was one of my first new in box engines. I flew it on my first rc plane the 'Big Stik'...It ran OK, but sometimes in mid air it would die for no reason, or the idle would be inconsistent...Now, I know why they were called 'Mostly Dead Stick'...That carb really made a difference...Good carbs and Bad carbs...
My MDS 48 runs abot 12 minutes with a 300 ml fuel tank. After 5 minutes flying the fuel mixture starts being too lean. Then I land the airplane and open the high speed needle 2 clicks and fly another 5 minutes. It is this engine: th-cam.com/video/S1FIjjyDfAs/w-d-xo.html
Hey David! Just going a bit off topic. did you know if an OS or ASP carb can replace a SuperTigre G45 one? Mine got chipped due to me over tightening it yo the engine block.
Unsure if the base OD's are the same. If they are then yes. Super Tigre carbs are so good I would suck to put an ASP carb on that engine. But in general if it fits in the engine it can be used as a replacement.
Done a good job Dave I've got one of them heaps of power but carbs are shit ran slightly better on castor oil carbs leak around throt barrel i think thats the reason for there tuning troubles 😀👍
It’s running like a champ now!
The second card ran really nice! It did not take long at all to get it dialed in. Very impressive.
Hi Bella! Great work Dave, what a difference.
LOL glad to see I'm not the only one that uses music wire under the tank rubber bands for a throttle detent..
I have a few MDS, we imported some in the late '80's - 90's. The FIRE .61 is a strong one, and oddly you can mate the crankcase and p/l to OPS .60/.65 parts, coincidence I suppose. The engines are strong runners with nice machining, ugly machine screws, and ghastly carbs. Any decent carb of appropriate bore can be adapted to them to make a world of difference.
iI've had several MDS engines, they were good engines, however i noticed on a couple of engines it was hard to tune the carb, i found the trick was to use OS glow plugs #3 or 6 plus i took a jewelers file and opened up the fuel metering tube a bit for extra fuel, the high spee needle didn't need to adjusted so far out to get it to run reliably
Yeah, no quality engine should ever require a person to use a jewelers file on any part of it. Garbage engines.
Fitting a Super Tigre carb to them was a popular mod when MDS engines first came out. The local model shop used to keep stocks of them for disgruntled MDS owners.
Years later we had an ARTF trainer donated to our club fitted with an MDS 58 IIRC. We had all sorts of problems with that caburetter. It would run at high speed but not at low speed or if you could get it to tick over it would not pick up. We gave the carburetter to a Rolls Royce trained engineer, yes that Rolls Royce. He machined a couple a little off the main needle. It made no difference. In the end I donated a Thunder Tiger GP 42 which flew the trainer perfectly.
I wouldn't have an MDS as a gift!
I have 3 of these MDS .40'S.. Which carbs can i use to replace the OEM's????
I had an early mds 48 and never could running right
Wonderfull run with a good carburetor, that crapy cheap OEM carb really sucks, but after your modifications you made it work, but with that ST 34 carby it's ANOTHER engine!
I had a MDS 48, I believe it was one of my first new in box engines. I flew it on my first rc plane the 'Big Stik'...It ran OK, but sometimes in mid air it would die for no reason, or the idle would be inconsistent...Now, I know why they were called 'Mostly Dead Stick'...That carb really made a difference...Good carbs and Bad carbs...
My MDS 48 runs abot 12 minutes with a 300 ml fuel tank. After 5 minutes flying the fuel mixture starts being too lean. Then I land the airplane and open the high speed needle 2 clicks and fly another 5 minutes. It is this engine: th-cam.com/video/S1FIjjyDfAs/w-d-xo.html
Hey David! Just going a bit off topic. did you know if an OS or ASP carb can replace a SuperTigre G45 one? Mine got chipped due to me over tightening it yo the engine block.
Unsure if the base OD's are the same. If they are then yes. Super Tigre carbs are so good I would suck to put an ASP carb on that engine. But in general if it fits in the engine it can be used as a replacement.
Done a good job Dave I've got one of them heaps of power but carbs are shit ran slightly better on castor oil carbs leak around throt barrel i think thats the reason for there tuning troubles 😀👍
Just shows better carb makes a lotta difference